Figure 3. Gene–environment interaction between outdoor time and minor allele dosage of rs2071623. Outdoor time in vertical direction: 0=low exposure; 1=high exposure. 0,1,2 in horizonal direction represent minor allele dosage of the SNP. Light gray bars indicate low risk, and dark gray bars represent high risk. The left column in each bar represents positive scores, while the left column shows negative scores. If the negative column is higher than the positive column, the combination of the SNP and the environment was protective, and vice versa.